How does Snape get away with it?

[sachmet96]

No: HPFGUIDX 83232


AP wrote:
> Ever since finding out that Snape is spying on Voldemort for 
> Dumbledore, I've wondered how he can get away with it.  In PS/SS, 
> Voldemort was on the back of Quirrell's head while Snape was 
warning 
> Q to figure out "where his loyalties lie" (quote may be wrong, 
don't 
> have books with me here).  Even through that purple turban, he was 
> bound to have heard the conversation. Then in GoF, it's likely 
> Crouch Jr., posing as Moody, overheard sensitive information that 
he 
> passed on to Voldemort via the eagle owl.  So it seems to me that 
> Voldemort would know where *Snape's* loyalties lie.  All that makes 
> me wonder -- what information is Snape giving to Voldemort et al to 
> convince them he is still a loyal DE and that makes him useful 
> enough to keep alive?  Is he being set up for a scene in which V 
> reveals that he knows Snape is a double agent before killing Snape?
> 
> Any thoughts?  (Sorry if this has come up before)
 > AP

sachmet96:
I have thought about that too, recently
Syd pointed in message 83169 to message 7901 that Voldemort already 
knows that Snape's loyalities lie not with him.

citing from message 7901
"Back in October/November one of the posters on Jenna's UHPFC board
attended a reading that JKR did in Vancouver.She reported that
afterwards there was a Q&A session, during which JKR was asked
straight out who the three "missing" Death Eaters were.JKR gave a
reply which apparently made it obvious that the faithful servant was
Barty, the coward was Karkaroff - and the one who had left forever
and who would be killed was Snape."

If this is true, then Snape can't be spying directly on Voldemort. 
There must be another way for him to spy (maybe he has a spy network 
or something like that).